JP2017147570A - User device, base station, capability information notification method, and capability discrimination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suitably notify a base station of capability information by a user device without increasing an amount of a control signal more than required.SOLUTION: A mobile communication system comprises a base station and a user device. The user device used in the system, comprises a capability information notification part that notify the base station of first capability information indicating that a first function is supported in the user device, and second capability information indicating the capability of a second function supported by the user device. When the capability information notification part notifies the base station of third capability information indicating the capability of the second function corresponding to the first function with the first capability information and the second capability information, the first function is determined that the capability of the second function indicated in the third capability information is included. When the third capability information is not notified, the first function is determined that the capability of the second function indicated in the second capability information is included.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technique in which a user apparatus UE in a mobile communication system notifies its own capability information to a base station eNB.

  In the LTE (including LTE-Advanced) system, it is defined that the user apparatus UE notifies the base station eNB of its capability (Capability) with a predetermined signaling message (UE-EUTRA-Capability) (non-patent). Reference 1). For example, in Non-Patent Document 1, when the user apparatus UE in the RRC connection state receives a UE capability request (UECapabilityEnquiry) from the base station eNB, the user apparatus UE sends UE capability information (UECapabilityInformation) to the base station eNB. Sending is described.

  There are various types of information in the capability information notified from the user apparatus UE to the base station eNB, but as the capability information notified from the user apparatus UE to the base station eNB, for example, the frequency band and modulation scheme supported by the user apparatus UE Etc.

3GPP TS 36.331 V12.8.0 (2015-12)

  As a more specific example, there is downlink 256QAM (quadture amplitude modulation) as capability information notified from the user apparatus UE to the base station eNB. By introducing downlink 256QAM as a modulation method, it is possible to increase the speed of downlink reception. However, in general, the difficulty of mounting increases compared to 16QAM and 64QAM with a small number of signal points. In particular, the difficulty level of mounting becomes high in a high frequency band.

  Further, as the capability information notified from the user apparatus UE to the base station eNB, there is a maximum number of downlink MIMO layers that can be handled. Note that the number of MIMO layers is the number of streams that can be transmitted simultaneously from the transmission side. The fact that the user apparatus UE supports a certain number of downlink MIMO layers means that it can receive the streams for the number of layers transmitted from the base station eNB, and can demodulate and decode the data.

  According to the specification described in Non-Patent Document 1, the user apparatus UE can notify the presence / absence of downlink 256QAM for each frequency band supported by the user apparatus UE, and notifies the corresponding maximum number of downlink MIMO layers for each frequency band. it can.

  Here, due to the complexity of the downlink 256QAM implementation in the user apparatus UE, for example, with respect to a certain frequency band, the number of downlink MIMO layers can be up to 4 if 16QAM or 64QAM. There may be cases where it is only possible to cope.

  However, in the related art, in the above case, the user apparatus UE cannot appropriately notify the capability information to the base station eNB. Here, it is conceivable that all user apparatuses UE notify the number of downlink MIMO layers for downlink 256QAM in addition to the notification of the number of downlink MIMO layers for each frequency band. If this is done, the amount of control signals will increase more than necessary, leading to an increase in network (NW) load, which is not preferable.

  The problems as described above are not limited to the number of downlink 256QAM and the number of downlink MIMO layers, and are problems that can occur in various functions that the user apparatus UE can have.

  The present invention has been made in view of the above points, and allows a user apparatus to appropriately notify capability information to a base station without increasing the amount of control signals more than necessary in a mobile communication system. It aims at providing the technology to do.

According to the disclosed technology, the user apparatus used in a mobile communication system including a base station and a user apparatus,
Notifying the base station of first capability information indicating that the first function is supported by the user apparatus and second capability information indicating the capability of the second function supported by the user apparatus. It has a capability information notification unit,
In addition to the first capability information and the second capability information, the capability information notification unit sends third capability information indicating the capability of the second function corresponding to the first function to the base station. In the base station, it is determined that the user apparatus has the capability of the second function indicated in the third capability information with respect to the first function,
In the case where the capability information notification unit does not notify the base station of the third capability information, in the base station, the user apparatus indicates the first capability in the second capability information. A user device is provided that is determined to have the capability of the second function.

According to the disclosed technology, the base station used in a mobile communication system including a base station and a user device,
The first capability information indicating that the first function is supported in the user device and the second capability information indicating the capability of the second function supported by the user device are received from the user device. A receiver,
A capability determination unit that determines the capability of the user device;
In addition to the first capability information and the second capability information, the reception unit receives third capability information indicating the capability of the second function corresponding to the first function from the user device. In this case, the capability determination unit determines that the user device has the capability of the second function indicated in the third capability information with respect to the first function,
When the receiving unit does not receive the third capability information from the user device, the capability determining unit indicates that the user device is indicated by the second capability information for the first function. A base station characterized by having the capability of the second function is provided.

  Moreover, according to the technique of an indication, the capability information notification method which the said user apparatus performs, and the capability determination method which the said base station performs are provided.

  According to the disclosed technology, in a mobile communication system, there is provided a technology that allows a user apparatus to appropriately notify capability information to a base station without increasing the amount of control signals more than necessary.

It is a block diagram of the communication system which concerns on embodiment of this invention. It is a sequence diagram which shows operation | movement of the communication system which concerns on embodiment of this invention. It is a figure for demonstrating the outline | summary of this Embodiment. It is a figure which shows the example of a specification change. It is a figure which shows the example of a specification change. It is a figure which shows the example of a specification change. It is a flowchart for demonstrating the operation example of eNB. It is a block diagram of the user apparatus UE. It is a HW block diagram of user apparatus UE. It is a block diagram of the base station eNB. It is a HW block diagram of base station eNB.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment. For example, the mobile communication system according to the present embodiment assumes a system based on LTE, but the present invention is not limited to LTE and can be applied to other systems. Further, in this specification and claims, “LTE” is used in a broad sense that may include a communication system (including 5G) corresponding to 3GPP Rel-12, 13, 14 or later.

(Whole system configuration)
FIG. 1 shows a configuration diagram of a communication system according to an embodiment of the present invention. As illustrated in FIG. 1, the communication system according to the present embodiment is a mobile communication system including a base station eNB and a user apparatus UE. Although FIG. 1 shows one base station eNB and one user apparatus UE, this is an example, and there may be a plurality of each.

  In the present embodiment, as illustrated in FIG. 2, the user apparatus UE sends a UE to the base station eNB based on a UE capability information request (eg, UE capability inquiry) transmitted from the base station eNB in step S101. The capability information is transmitted (step S102).

  Note that the notification method illustrated in FIG. 2 is an example. For example, the user apparatus UE may notify the base station eNB of UE capability information without receiving a UE capability information request from the base station eNB. Hereinafter, for convenience, the user apparatus UE and the base station eNB are described as UE and eNB, respectively.

(Outline of ability information notification method)
As a basic operation, the UE transmits capability information having the presence / absence of downlink 256QAM and the corresponding maximum number of downlink MIMO layers to the eNB for each frequency band that the UE supports (supports). In the present specification, the “number of downlink MIMO layers” may be referred to as “the number of existing downlink MIMO layers” for the sake of convenience in the sense that it is described in the existing specifications.

  The notification of the number of existing downlink MIMO layers shall correspond to the number of existing downlink MIMO layers in any modulation scheme, unless there is a notification of the number of additional downlink MIMO layers (notification of the number of downlink MIMO layers corresponding to downlink 256QAM) described later. Indicates.

  When using the downlink 256QAM, the UE additionally notifies the eNB of the maximum number of downlink MIMO layers that can be handled for the downlink 256QAM when the number does not correspond to the number of existing downlink MIMO layers. Note that the UE may notify the number of additional downlink MIMO layers as described above even when the downlink 256QAM is used and the existing downlink MIMO layer number is supported. In this specification, the number of downlink MIMO layers to be notified additionally may be referred to as “number of additional downlink MIMO layers” for convenience.

  If the eNB does not receive a notification of the number of additional downlink MIMO layers from the UE, the UE determines that the downlink 256QAM is used corresponding to the number of existing downlink MIMO layers in the corresponding frequency band.

  Also, when the eNB receives a notification of the number of additional downlink MIMO layers from the UE, the UE determines that the number of additional downlink MIMO layers is supported when using downlink 256QAM in the corresponding frequency band. .

  The eNB that has made the above determinations performs configuration for the UE and scheduling for the UE within the range of the maximum number of downlink MIMO layers supported by the UE with respect to downlink 256QAM.

  A specific example will be described with reference to FIGS. 3 (a) and 3 (b) show transmission of information about a certain frequency band to which the UE corresponds. Actually, capability information including such information is notified to the eNB for each frequency band to which the UE corresponds.

  In the example of FIG. 3A, the UE transmits “downlink MIMO layer number = 4” (existing downlink MIMO layer number) and “supports downlink 256QAM” to the eNB as capability information for a certain frequency band to which the UE corresponds. To do. In the example of FIG. 3A, information on the number of downlink MIMO layers (number of additional downlink MIMO layers) for downlink 246QAM is not notified.

  In this case, the eNB determines that the UE supports the maximum number of downlink MIMO layers = 4 for downlink 256QAM in the frequency band.

  In the example of FIG. 3 (b), as the capability information for the frequency band, the UE has “downlink MIMO layer number = 4” (existing downlink MIMO layer number), “supports downlink 256QAM”, and “downlink for downlink 256QAM”. The number of MIMO layers = 2 ”(the number of additional downlink MIMO layers) is transmitted to the eNB.

  In this case, the eNB determines that the UE supports the maximum number of downlink MIMO layers = 2 for downlink 256QAM in the frequency band.

(Specification change example)
4 to 6 show a description example (extract) of 3GPP specifications (3GPP TS 36.331) that defines the operation of the communication system according to the present embodiment. In FIG. 4 to FIG. 6, portions that are changed from Non-Patent Document 1, which is an existing specification, are underlined. In addition, the example described in FIGS. 4-6 is an example.

  First, a first example will be described with reference to FIGS. 4 (a) and 4 (b).

  FIG. 4A shows a “UE-EUTRA-Capability information element” (UE capability information element) in the first example. As shown in FIG. 4A, a field indicated by “supportedMIMO-CapabilityDL-256QAM-r12” (downlink MIMO capability supported for downlink 256QAM) is added.

  FIG. 4B shows the explanation part of “supportedMIMO-CapabilityDL-256QAM-r12”. As shown in FIG. 4B, this field corresponds to the case where the UE corresponds to downlink 256QAM for a certain frequency band, and the downlink 256QAM is set from the eNB (that is, the UE uses downlink 256QAM). And the maximum number of downlink MIMO layers (the number of spatial multiplexing layers). When the field does not exist in the capability information notified from the UE to the eNB for the frequency band, the maximum number of downlink MIMO layers of the UE for which downlink 256QAM is set (the maximum downlink MIMO layer that can be set for the UE) The number) follows the number of existing downlink maximum MIMO layers notified from the UE to the eNB for the frequency band. More specifically, the existing maximum downlink MIMO layer number is suppportedMIMO-CapabilityDL-r10, supportedMIMO-CapabilityDL-r12, fourLayerTM3-TM4-r10, fourLayerTM3-TM4-perCC-r12, or the maximum layers indicated by ue It is a parameter value such as -Category.

  A second example will be described with reference to FIGS. In the first example described above, MIMO-CapabilityDL (a value of 2 layers, 4 layers, or 8 layers) is notified as the number of additional downlink MIMO layers. In the second example, the number of additional downlink MIMO layers is “ Any one of information indicating “corresponding to 8 layers”, information indicating “corresponding to 4 layers”, and information indicating “corresponding to 2 layers” is notified. Although the first example and the second example are different in the method of reporting the number of downlink MIMO layers, it can be said that they are substantially the same.

  FIG. 5 shows “UE-EUTRA-Capability information element” (UE capability information element) in the second example. As shown in FIG. 5, “eightLayerDL-256QAM-r12” (maximum downlink MIMO layer number for downlink 256QAM = 8), “fourLayerDL-256QAM-r12” (maximum downlink MIMO layer number for downlink 256QAM = 4), “twoLayerDL- Each field indicated by “256QAM-r12” (maximum number of downlink MIMO layers to be downlink 256QAM = 2) is added.

  FIG. 6A shows the explanation part of “eightLayerDL-256QAM-r12”. As shown in FIG. 6A, this field corresponds to the maximum downlink MIMO layer number = 8 when the UE supports downlink 256QAM for a certain frequency band and when downlink 256QAM is set from the eNB. Specify whether or not to do so. For the frequency band, when the field does not exist (and when fourLayerDL-256QAM-r12 and twoLayerDL-256QAM-r12 also do not exist), the maximum number of downlink MIMO layers of the UE in which downlink 256QAM is set is It follows the existing maximum downlink MIMO layer number notified from the UE to the eNB for the frequency band. A specific example is the same as in the case of FIG.

  In the case of “fourLayerDL-256QAM-r12” and “twoLayerDL-256QAM-r12” shown in FIGS. 6B and 6C, the “eightLayerDL-256QAM-” described above is used except that the number of layers is 4 or 2. The same as in the case of r12 ".

(Example of judgment operation of eNB)
Next, with reference to the flowchart illustrated in FIG. 7, an operation example of determination in the eNB that receives capability information from the UE will be described. This operation example shows a determination operation in the eNB that has received capability information regarding a certain frequency band (this is frequency band B) supported by the UE.

  In step S101, the eNB receives information indicating that the number of downlink MIMO layers (the number of existing downlink MIMO layers) is the A layer and corresponds to downlink 256QAM based on the capability information received from the UE. Confirm.

  In step S102, the eNB confirms whether or not the above-described additional field is present, thereby determining whether or not the downlink MIMO layer number information (additional downlink MIMO layer number) for the downlink 256QAM is received.

  If the determination in step S102 is Yes, that is, if information on the number of additional downlink MIMO layers is received, the process proceeds to step S103, and the eNB determines that the UE is the maximum for downlink 256QAM in the frequency band B. It is determined that the number corresponds to the number of additional downlink MIMO layers.

  On the other hand, if the determination in step S102 is No, that is, if the information on the number of additional downlink MIMO layers has not been received, the process proceeds to step S104, and the eNB performs the following operation on the downlink 256QAM in the frequency band B: It is determined that the number of existing downlink MIMO layers corresponds to the A layer at the maximum.

(Device configuration)
Next, configuration examples of the UE and the eNB will be described.

<User device UE>
FIG. 8 shows a functional configuration diagram of the UE in the present embodiment. As illustrated in FIG. 8, the UE includes a DL signal receiving unit 101, a UL signal transmitting unit 102, a UE capability information storage unit 103, and a UE capability information notification control unit 104. FIG. 8 shows only functional units particularly related to the embodiment of the present invention in the UE, and also has a function (not shown) for performing an operation based on LTE. The functional configuration shown in FIG. 8 is only an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  The DL signal receiving unit 101 includes a function of receiving various downlink signals from the eNB and acquiring higher layer information from the received physical layer signal, and the UL signal transmitting unit 102 should be transmitted from the UE It includes a function of generating various physical layer signals from higher layer information and transmitting them to the eNB. It is assumed that each of the DL signal receiving unit 101 and the UL signal transmitting unit 102 includes a packet buffer and includes at least layer 1 (PHY) and layer 2 (MAC, RLC, PDCP) processing functions. However, it is not limited to this.

  The UE capability information storage unit 103 stores UE capability information including capability information related to the downlink 256QAM and the downlink MIMO number supported by the UE itself. The UE capability information may be information on a parameter format notified by a Capability RRC message, or may be information on other formats.

  The UE capability information notification control unit 104 acquires its capability information from the UE capability information storage unit 103, creates a Capability RRC message, and notifies the base station eNB from the UL signal transmission unit 102. The capability information includes capability information related to downlink 256QAM and capability information related to the number of downlink MIMO layers, as described above, in addition to information such as supported frequency bands. For example, the UE capability information notification control unit 104 creates a Capability RRC message including the information elements illustrated in FIGS. 4 to 6 and transmits the RRC message to the eNB.

  The configuration of the UE shown in FIG. 8 may be entirely realized by a hardware circuit (eg, one or a plurality of IC chips), or part of the configuration may be realized by a hardware circuit, and the other part may be a CPU and a program. And may be realized.

  FIG. 9 is a diagram illustrating an example of a hardware (HW) configuration of the UE. FIG. 9 shows a configuration closer to the mounting example than FIG. As shown in FIG. 9, the UE controls an apparatus that performs processing such as an RE (Radio Equipment) module 151 that performs processing related to a radio signal, a BB (Base Band) processing module 152 that performs baseband signal processing, and a higher layer. It has a module 153 and a USIM slot 154 which is an interface for accessing a USIM card.

  The RE module 151 should transmit the digital baseband signal received from the BB processing module 152 from the antenna by performing D / A (Digital-to-Analog) conversion, modulation, frequency conversion, power amplification, and the like. Generate a radio signal. In addition, a digital baseband signal is generated by performing frequency conversion, A / D (Analog to Digital) conversion, demodulation, and the like on the radio signal received from the antenna, and the digital baseband signal is passed to the BB processing module 152. The RE module 151 includes functions such as a physical layer in the DL signal receiving unit 101 and the UL signal transmitting unit 102 in FIG.

  The BB processing module 152 performs processing for mutually converting an IP packet and a digital baseband signal. A DSP (Digital Signal Processor) 162 is a processor that performs signal processing in the BB processing module 152. The memory 172 is used as a work area for the DSP 162. The BB processing module 152 includes, for example, the DL signal reception unit 101 in FIG. 8, functions such as layer 2 in the UL signal transmission unit 102, the UE capability information storage unit 103, and the UE capability information notification control unit 104. Note that all or part of the functions of the UE capability information storage unit 103 and the UE capability information notification control unit 104 may be included in the device control module 153.

  The device control module 153 performs IP layer protocol processing, various application processing, and the like. The processor 163 is a processor that performs processing performed by the device control module 153. The memory 173 is used as a work area for the processor 163. The processor 163 reads and writes data with the USIM through the USIM slot 154.

<Base station eNB>
FIG. 10 shows a functional configuration diagram of the base station eNB in the present embodiment. As illustrated in FIG. 10, the base station eNB includes a DL signal transmission unit 201, a UL signal reception unit 202, a UE capability information storage unit 203, and a UE capability determination unit 204. FIG. 10 shows only functional units that are particularly related to the embodiment of the present invention in the eNB, and also has a function (not shown) for performing an operation based on at least LTE. Further, the functional configuration shown in FIG. 10 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  The DL signal transmission unit 201 includes a function of generating various types of physical layer signals from information on higher layers to be transmitted from the eNB and transmitting the signals to the UE. The UL signal receiving unit 202 includes a function of receiving various uplink signals from the UE and acquiring higher layer information from the received physical layer signals. It is assumed that each of the DL signal transmission unit 201 and the UL signal reception unit 202 includes a packet buffer and includes at least layer 1 (PHY) and layer 2 (MAC, RLC, PDCP) processing functions. However, it is not limited to this.

  The UE capability information storage unit 203 stores capability information (information notified by a Capability RRC message) received from the UE. Particularly in the present embodiment, the capability information stored in UE capability information storage section 203 includes information on the number of downlink MIMO layers for downlink 256QAM determined by UE capability determination section 204.

  The UE capability determination unit 204 uses the logic described with reference to FIGS. 3 to 7 and the like to determine the maximum downlink MIMO layer number for the downlink 256QAM of the UE based on the capability information notified in the Capability RRC message. The determination result is stored in the UE capability information storage unit 203. Note that the information on the maximum number of downlink MIMO layers for downlink 256QAM stored in the UE capability information storage unit 203 is used, for example, in downlink data scheduling for the corresponding UE.

  The configuration of the eNB shown in FIG. 10 may be entirely realized by a hardware circuit (eg, one or a plurality of IC chips), a part is constituted by a hardware circuit, and the other part is a CPU and a program. And may be realized.

  FIG. 11 is a diagram illustrating an example of a hardware (HW) configuration of the eNB. FIG. 11 shows a configuration closer to the mounting example than FIG. As shown in FIG. 11, the eNB is connected to the network by an RE module 251 that performs processing related to a radio signal, a BB processing module 252 that performs baseband signal processing, a device control module 253 that performs processing such as an upper layer, and the like. And a communication IF 254 which is an interface for this purpose.

  The RE module 251 generates a radio signal to be transmitted from the antenna by performing D / A conversion, modulation, frequency conversion, power amplification, and the like on the digital baseband signal received from the BB processing module 252. In addition, a digital baseband signal is generated by performing frequency conversion, A / D conversion, demodulation, and the like on the radio signal received from the antenna, and is passed to the BB processing module 252. The RE module 251 includes functions such as a physical layer in the DL signal transmission unit 201 and the UL signal reception unit 202 in FIG.

  The BB processing module 252 performs processing for mutually converting an IP packet and a digital baseband signal. The DSP 262 is a processor that performs signal processing in the BB processing module 252. The memory 272 is used as a work area for the DSP 252. The BB processing module 252 includes, for example, functions such as layer 2 in the DL signal transmission unit 201 and the UL signal reception unit 202 in FIG. 10, a UE capability information storage unit 203, and a UE capability determination unit 204. Note that all or part of the functions of the UE capability information storage unit 203 and the UE capability determination unit 204 may be included in the device control module 253.

  The device control module 253 performs IP layer protocol processing, OAM processing, and the like. The processor 263 is a processor that performs processing performed by the device control module 253. The memory 273 is used as a work area for the processor 263. The auxiliary storage device 283 is an HDD, for example, and stores various setting information for the base station eNB itself to operate.

  Note that the configuration (functional category) of the apparatus illustrated in FIGS. 8 to 11 is merely an example of a configuration that implements the processing described in the present embodiment. As long as the processing described in this embodiment can be realized, the mounting method (specific arrangement of functional units, names, and the like) is not limited to a specific mounting method.

(Other examples)
In the present embodiment, the downlink 256QAM and the number of downlink MIMO layers are cited as UE capabilities, but these are merely examples. For example, the capability information notification similar to that in the downlink direction can be performed in the uplink direction. Also, instead of downlink 256QAM, the same capability information notification as in the case of downlink 256QAM can be performed for other modulation schemes (eg, a modulation scheme having more signal points than 256QAM). In addition, the capability information notification similar to the case of downlink 256QAM can be performed for capabilities other than the modulation scheme.

  Furthermore, instead of the number of downlink MIMO layers, the capability information notification similar to the case of the number of downlink MIMO layers can be performed for other capabilities. An example of the capability used instead of (or in addition to) the number of downlink MIMO layers is the number of CSI (Channel State Information) processes. The number of CSI processes is the maximum number of CSI processes that can be used by the UE when CoMP (Coordinated Multi-Point transmission / reception) is applied. As for the number of CSI processes, similarly to the number of downlink MIMO layers, the UE notifies the eNB of the capability for each downlink frequency band. That is, the “number of existing CSI processes” similar to the “number of existing downlink MIMO layers” exists. Then, the “number of additional CSI processes” for the downlink 256QAM can be introduced into the signaling in the same manner as the “number of additional MIMO layers” for the downlink 256QAM described above. In this case, the determination on the eNB side can be performed in the same manner as in the case of the “number of additional MIMO layers”.

(Summary of embodiment)
As described above, in the present embodiment, the user apparatus used in the mobile communication system including the base station and the user apparatus, and the first function is supported in the user apparatus. A capability information notification unit that notifies the base station of first capability information that indicates and second capability information that indicates the capability of the second function supported by the user apparatus, and the capability information notification unit includes: When notifying the base station of third capability information indicating the capability of the second function corresponding to the first function, in addition to the first capability information and the second capability information, the base station In the station, the user apparatus is determined to have the capability of the second function indicated in the third capability information with respect to the first function, and the capability information notification unit Pass capability information to the base station Otherwise, the base station determines that the user apparatus has the capability of the second function indicated in the second capability information with respect to the first function. A user equipment is provided.

  In the above configuration, for example, the user apparatus has the second function capability (e.g., maximum downlink MIMO layer number = 8) indicated by the second capability information for the first function (e.g., downlink 256QAM). In the case of support, it is not necessary to notify the third capability information. On the other hand, when the user apparatus does not support the capability of the second function indicated by the second capability information (eg, maximum downlink MIMO layer number = 8) for the first function, the third capability information The capability of the second function to be supported (for example, the maximum number of downlink MIMO layers = 4) can be notified.

  That is, with the above configuration, the user apparatus can appropriately notify the base station of capability information without increasing the amount of control signal more than necessary.

  The first function is, for example, a predetermined modulation scheme, and more specifically, for example, downlink 256QAM. With this configuration, the user apparatus can appropriately notify the base station of capability information according to the capability of the second function for a predetermined modulation scheme.

  The capability of the second function is, for example, the maximum number of downlink MIMO layers supported by the user apparatus or the maximum number of CSI processes supported by the user apparatus. With this configuration, the user apparatus appropriately transmits capability information to the base station according to the maximum number of downlink MIMO layers supported for the first function or the maximum number of CSI processes supported for the first function. Notification can be made.

  In addition, according to the present embodiment, the base station used in a mobile communication system including a base station and a user apparatus, the first capability indicating that the first function is supported in the user apparatus A receiving unit that receives information and second capability information indicating the capability of the second function supported by the user device from the user device, and a capability determination unit that determines the capability of the user device, In addition to the first capability information and the second capability information, the receiving unit receives third capability information indicating the capability of the second function corresponding to the first function from the user device. In this case, the capability determination unit determines that the user device has the capability of the second function indicated in the third capability information with respect to the first function, and the reception unit Before the third ability information When not received from the user device, the capability determining unit determines that the user device has the capability of the second function indicated by the second capability information with respect to the first function. A base station is provided.

  By providing the base station with the function shown in the above configuration, the base station can appropriately determine the capability of the user apparatus without increasing the amount of control signal more than necessary.

  Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. For convenience of explanation, the base station eNB and the user apparatus UE have been described using functional block diagrams, but such an apparatus may be realized by hardware, software, or a combination thereof. According to the embodiment of the present invention, software that is operated by a processor included in the user equipment UE and the base station eNB includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, register, hard disk ( (HDD), a removable disk, a CD-ROM, a database, a server, or any other suitable storage medium.

  The present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from the spirit of the present invention.

UE user apparatus eNB base station 101 DL signal receiving section 102 UL signal transmitting section 103 UE capability information storing section 104 UE capability information notification control section 151 RE module 152 BB processing module 153 apparatus control module 154 USIM slot 201 DL signal transmitting section 202 UL Signal reception unit 203 UE capability information storage unit 204 UE capability determination unit 251 RE module 252 BB processing module 253 Device control module 254 Communication IF

Claims (7)

The user equipment used in a mobile communication system comprising a base station and a user equipment,
Notifying the base station of first capability information indicating that the first function is supported by the user apparatus and second capability information indicating the capability of the second function supported by the user apparatus. It has a capability information notification unit,
In addition to the first capability information and the second capability information, the capability information notification unit sends third capability information indicating the capability of the second function corresponding to the first function to the base station. In the base station, it is determined that the user apparatus has the capability of the second function indicated in the third capability information with respect to the first function,
In the case where the capability information notification unit does not notify the base station of the third capability information, in the base station, the user apparatus indicates the first capability in the second capability information. It is judged that it has the capability of the said 2nd function. The user apparatus characterized by the above-mentioned.   The user apparatus according to claim 1, wherein the first function is a predetermined modulation method.   The user apparatus according to claim 2, wherein the predetermined modulation scheme is downlink 256QAM. The capability of the second function is the maximum number of downlink MIMO layers supported by the user equipment or the maximum number of CSI processes supported by the user equipment. A user device given in any 1 paragraph. The base station used in a mobile communication system comprising a base station and user equipment,
The first capability information indicating that the first function is supported in the user device and the second capability information indicating the capability of the second function supported by the user device are received from the user device. A receiver,
A capability determination unit that determines the capability of the user device;
In addition to the first capability information and the second capability information, the reception unit receives third capability information indicating the capability of the second function corresponding to the first function from the user device. In this case, the capability determination unit determines that the user device has the capability of the second function indicated in the third capability information with respect to the first function,
When the receiving unit does not receive the third capability information from the user device, the capability determining unit indicates that the user device is indicated by the second capability information for the first function. It is judged that it has the capability of said 2nd function. The base station characterized by the above-mentioned. A capability information notification method executed by the user apparatus used in a mobile communication system including a base station and a user apparatus,
Notifying the base station of first capability information indicating that the first function is supported by the user apparatus and second capability information indicating the capability of the second function supported by the user apparatus. A capability information notification step,
In the capability information notification step, in addition to the first capability information and the second capability information, the user device indicates a third capability indicating the capability of the second function corresponding to the first function. When notifying the base station of the information, the base station determines that the user apparatus has the capability of the second function indicated in the third capability information with respect to the first function. And
In the capability information notification step, when the user apparatus does not notify the base station of the third capability information, the user apparatus performs the second function for the first function in the base station. It is judged that it has the capability of the said 2nd function shown by capability information of the capability information notification method characterized by the above-mentioned. A capability determination method executed by the base station used in a mobile communication system including a base station and a user device,
The first capability information indicating that the first function is supported in the user device and the second capability information indicating the capability of the second function supported by the user device are received from the user device. Receiving step;
A capability determination step of determining the capability of the user device,
In the receiving step, in addition to the first capability information and the second capability information, third capability information indicating the capability of the second function corresponding to the first function is received from the user device. In this case, in the capability determination step, the base station determines that the user apparatus has the capability of the second function indicated in the third capability information with respect to the first function. ,
When the receiving step does not receive the third capability information from the user apparatus, in the capability determining step, the base station determines that the user apparatus performs the second function for the first function. It is judged that it has the capability of the said 2nd function shown by capability information. The capability determination method characterized by the above-mentioned.

Images